The announcement last week by the United States of the largest military aid package in its history – to Israel – was a win for both sides.

Israeli prime minister Benjamin Netanyahu could boast that his lobbying had boosted aid from $3.1 billion to $3.8bn a year – a 22 per cent increase – for a decade starting in 2019.

Netanyahu has presented this as a rebuff to those who accuse him of jeopardising Israeli security interests with his government’s repeated affronts to the White House.

In the past weeks alone, defence minister Avigdor Lieberman has compared last year’s nuclear deal between Washington and Iran with the 1938 Munich pact, which bolstered Hitler; and Netanyahu has implied that US opposition to settlement expansion is the same as support for the “ethnic cleansing” of Jews.

American president Barack Obama, meanwhile, hopes to stifle his own critics who insinuate that he is anti-Israel. The deal should serve as a fillip too for Hillary Clinton, the Democratic party’s candidate to succeed Obama in November’s election.

In reality, however, the Obama administration has quietly punished Netanyahu for his misbehaviour. Israeli expectations of a $4.5bn-a-year deal were whittled down after Netanyahu stalled negotiations last year as he sought to recruit Congress to his battle against the Iran deal.

In fact, Israel already receives roughly $3.8bn – if Congress’s assistance on developing missile defence programmes is factored in. Notably, Israel has been forced to promise not to approach Congress for extra funds.

Netanyahu’s agreement to such terms has incensed Israeli loyalists in Congress such as Republican Senator Lindsey Graham, who had been fighting Netanyahu’s corner to win an even larger aid handout from US taxpayers. He accused the Israeli prime minister on Friday of having “pulled the rug from under us”.

As Ehud Barak, Netanyahu’s former defence minister, also pointed out in a series of TV interviews in Israel, the deal fails to take into account either inflation or the dollar’s depreciation against the shekel.

A bigger blow still is the White House’s demand to phase out a special exemption that allowed Israel to spend nearly 40 per cent of aid locally on weapon and fuel purchases. Israel will soon have to buy all its armaments from the US, ending what amounted to a subsidy to its own arms industry.

Netanyahu preferred to sign the deal now rather than wait till the next president is installed, even though Clinton and her Republican challenger, Donald Trump, are expected to be even more craven towards Israel. That appears to reflect Netanyahu’s fear that the US political environment will be more uncertain after the election and could lead to long delays in an agreement, and apprehension about the implications for Israel of Trump’s general opposition to foreign aid.

Nonetheless, Washington’s renewed military largesse – in the face of almost continual insults – inevitably fuels claims that the Israeli tail is wagging the US dog. Even the New York Times has described the aid package as “too big”.

Since the 1973 war, Israel has received at least $100bn in military aid, with more assistance hidden from view. Back in the 1970s, Washington paid half of Israel’s military budget. Today it still foots a fifth of the bill, despite Israel’s economic success.

But the US expects a return on its massive investment. As the late Israeli politician-general Ariel Sharon once observed, Israel has been a US “aircraft carrier” in the Middle East, acting as the regional bully and carrying out operations that benefit Washington.

Almost no one implicates the US in Israeli attacks that wiped out Iraq and Syria’s nuclear programmes. A nuclear-armed Iraq or Syria, however, would have deterred later US-backed moves at regime overthrow, as well as countering the strategic advantage Israel derives from its own large nuclear arsenal.

In addition, Israel’s US-sponsored military prowess is a triple boon to the US weapons industry, the country’s most powerful lobby. Public funds are siphoned off to let Israel buy goodies from American arms makers. That, in turn, serves as a shop window for other customers and spurs an endless and lucrative game of catch-up in the rest of the Middle East.

The first F-35 fighter jets to arrive in Israel in December – their various components produced in 46 US states – will increase the clamour for the cutting-edge warplane.

Israel is also a “front-line laboratory”, as former Israeli army negotiator Eival Gilady admitted at the weekend, that develops and field-tests new technology Washington can later use itself.

The US is planning to buy back the missile interception system Iron Dome – which neutralises battlefield threats of retaliation – it largely paid for. Israel works closely too with the US in developing cyber­warfare, such as the Stuxnet worm that damaged Iran’s civilian nuclear programme.

But the clearest message from Israel’s new aid package is one delivered to the Palestinians: Washington sees no pressing strategic interest in ending the occupation. It stood up to Netanyahu over the Iran deal but will not risk a damaging clash with Israel and its loyalists in Congress over Palestinian statehood.

Some believe that Obama signed the aid agreement to win the credibility necessary to overcome his domestic Israel lobby and pull a rabbit from the hat: an initiative, unveiled shortly before he leaves office, that corners Netanyahu into making peace.

Hopes have been raised by an expected meeting at the United Nations in New York on Wednesday. But their first talks in 10 months are planned only to demonstrate the unity necessary to confound critics of the aid deal.

If Obama really wanted to pressure Netanyahu, he would have used the aid agreement as leverage. Now Netanyahu need not fear US financial retaliation, even as he intensifies effective annexation of the West Bank.

Netanyahu has drawn the right lesson from the aid deal – he can act again the Palestinians with continuing impunity and lots of US military hardware.